What color are runway centerline markings at O'Hare Airport?

Runway centerline markings at O'Hare Airport are white. This color is standardized for runway centerlines across airports in the United States and is used to provide guidance to aircraft during takeoff and landing. The white color helps to enhance visibility against the runway surface, particularly during low-light conditions or inclement weather. This ensures that pilots can accurately align their aircraft with the runway centerline for safe operations.

Other colors such as red, yellow, or blue are used for different purposes within the airport environment. For example, yellow markings are often used for taxiway centerlines and edges, while red can denote areas where vehicles are not allowed. Understanding these color codes is crucial for pilots and ground personnel to navigate the airport safely and efficiently.